I've finally found something I've been wanting ever since I got my first 3-pt hitch. A quick attach system for CAT 0 hitches
I know that GARY400 has addressed this with a very well built quick hitch, but like all of them with that design, all of your impliments have to have the same distances between the lift pins and top link attachment. That isn't always the case.
I liked the idea of Pat's EZ Change system, but they don't make it in CAT 0.
The only drawback to Pat's is that it does extend the lift arms, and that would lessen the amount of weight you would be able to lift due to the longer length.
I just stumbled on this system, the Carter EZ Hitch:
Now, it's not perfect either. While it doesn't extend the length of the lift arm, if does make the attachment point HIGHER. That means that it won't let the implement to drop as far. I guess that you could overcome that to some extend with an adjustment of the lift links though. It's also not as 'automatic' as Pat's, but still better than wrestling with the ball joint on the standard 3-pt.
The BEST thing about the Carted system though is that it's available for CAT 0!!!
This is definitely going on my MUST HAVE list